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MENDERES MASİFİ" NDEKİ (BATI ANADOLU) GNAYSİK GRANİTLERİN YERLEŞİM ÖZELLİKLERİ VE MASİFİN TEKTONİK EVRİMİNDEKİ YERİ; YENİ ARAZİ BULGULARI VE YAŞ TAYİNLERİ

Journal Name:

  • Maden Tetkik ve Arama Dergisi

Publication Year:

  • 2011

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Understanding the ages and emplacement mechanism of the gneissic granites cropping out in large areas of the Menderes Massif has a critical importance in its tectonic evolution. Based on some radiogenic age data, the gneissic granites and the surrounding high-grade micaschists have been advocated to be the Precambrian "Core Succession" that was undergone high-grade metamorphism during the Pan-African Orogenesis. The micascists and marbles of Palaezoic-Mesozoic age have been defined as the "Cover Succession" unconformably overlying the core assemblages. It has also been indicated that during the Alpine Orogenesis and by the Main Menderes Metamorphism the core and cover successions were metamorphosed together in relatively lower grade conditions. Although the Menderes succession underlies a large region in the western Anatolia and display uncovered outcrops, in nowhere structural evidences of the unconformity between Pan-Africa n core and the Palaeozoic-Mesozoic cover series has been reported. It is very difficult to expect the Alpine Orogeny to erase the older Pan-African structures to a point of undefinable state. In this study, we have new mapped and examined the boundary relations between the so-called Pre-Cambrian core and Palaeozoic-Mesozoic country succession around Dibek Mountain, Çine-Yatağan and incirliova Dam site. In Dibek Mountain gneissic granites were emplaced, as migmatitic fronts, into the marble lenses-bearing micaschists paralel to their foliation planes. Along the Çine-Yatağan road, migmatitic syn-tectonic granitic fronts injected into and engulfed the Palaeozoic black marble, black chert and micaschist alternation. In this region, the Palaeozoic units pass upward into the Triassic metadetritals with mafic volcanic intervals and they in turn grade into the Mesozoic plat¬form-type marble succession. In this location the granites intrude into the Palaezoic and Mesozoic series which were paleontologically dated in some other areas of the masif. Similarly around the incirliova Dam site the augen gneisse-migmatitic granite complex intruded into a complete stratigraphic section from Palaeozoic to Triassic and the Mesosozic marble succession. New field data indicate that the high-temperature-type Barrowien Main Menderes Metamorphism caused a rejuvenation in the crust and granites with large migmatitic fronts emplaced syntectonically into the entire section of the masif from thick metadetrital units below and the Palaeozoic-Mesozoic cower series above. Precambrian and Alpine zircon ages determined from the gneissic granites could be explained by the rejuvenation and migmatism during the Main Menderes Metamorphism.
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Abstract (Original Language): 
Menderes Masifi' nin çok geniş bölümlerinde yüzeyleyen gnaysik granitlerin yerleşim yaşları ve mekanizmalarının belirlenmesi, masifin tektonik evriminin anlaşılması açısından kritik önem taşır. Birçok araştırıcı bu gnayslardan elde ettikleri radyojenik zirkon yaşlarına dayanarak granitlerin ve yüksek dereceli mikaşistlerden oluşan yan kayalarının Menderes Masifi' nin Prekambriyen yaşlı "Çekirdeği" olduğunu ve Pan-Afrikan orojenezi sırasında yüksek dereceli metamorfizma geçirdiğini savunur. Mikaşist ve mermerlerden oluşan Paleozoyik-Mesozoyik yaşlı "Örtü birimleri" olarak tanımlanmış istifin "çekirdek birimlerini" uyumsuz olarak örtmüş olduğu belirtilir. Alpin orojenezi sırasındaki Ana Menderes Metamorfizması sırasında "Çekirdek" ve "Örtü birimleri" birlik¬te fakat daha düşük dereceli metamorfizmaya uğradığı ileri sürülür. Menderes Masifi kayaları Batı Anadolu'da çok geniş ve açık mostralar sunmasına rağmen Pan-Afrikan çekirdek ile örtü birimleri arasında olması beklenen açısal diskordansın yapısal verileri hiçbir yerde açık olarak saptanamamıştır. Alpin olaylarının Pan-Afrikan yapılarını tamamen silmiş olması açıklanması zor bir sorun olarak durmaktadır. Bu çalışmada Menderes Masifi'nde Prekambriyen yaşlı çekirdek olarak tanımlanan gnaysik granitler ile Paleozoyik-Mesozoyik çevre kayaların ilişkisi Dibekdağı, Çine-Yatağan yolu ve incirliova Barajı alanlarında yeniden haritalanarak incelenmiştir. Dibekdağı alanında gnaysik granitler çevre kayaların foliasyonu boyunca migmatitik cepheler şeklinde mermer mercekleri içeren mikaşistlerin içine yerleşmiştir. Şistlerden granitlerin içerisine doğru çevre kayalar derece derece özümlenir ve kuvarso-feldspatik mercekler ve girdiler artarak magmatik cephenin içine girilir. Çine-Yatağan Yolu boyunca migmatitik sintektonik granitik cephe, masifin Paleozoyik yaşlı siyah mermer, siyah çört ve şist ardalanmasını yutarak yerleşmiştir. Bu alanda Paleozoyik birimler stratigrafik olarak üste doğru Triyas yaşlı mafik volkanik ara katkılı kırıntılı birimlere ve onlar da Mesozoyik platform mermerlerine geçer. Bu alanda yaşları masifin başka böl¬gelerinde fosillerle belirlenmiş ve fasiyesleri iyi bilinen Paleozoyik-Mesozoyik örtü birimleri gnaysik granitler tarafından yutulmuştur. Benzer şekilde, incirliova baraj alanında gözlü gnays-migmatitik granit kompleksi Paleozoyik yaşlı siyah çört ve mermer istifini ve onların üzerine gelen Triyas metakırıntılı kayalarını ve en üstte Mesozoyik beyaz mermer istifinin tümünü keser. Yeni saha verileri yüksek sıcaklık trendine sahip Barroviyen tipi Ana Menderes Metamorfizması' nın kabukta rejüvenasyona neden olduğunu ve migmatitik cepheler şeklinde yük¬selen sintektonik granitlerin oluştuğunu ve bunların hem çekirdek-örtü sınırını hem de Paleozoyik-Mesozoyik örtü birimlerini yutarak yerleştiğini gösterir. Masifteki gnaysik granitlerden yaygın olarak elde edilen Prekambriyen ve yer yer ise Alpin yaşları bu tür bir rejüvenasyon ve migmatitleşme ile açıklanabilir.
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